You can't have Herb and Dyson on the court at the same time. Neither is a good shooter. You need to have one of Hawkins or Murphy on the floor with them or the offense will stall unless its fast break points.
Actually we did pretty well with Herb and Dyson on the floor simultaneously. Sure we sacrifice some 3pt shooting but their defense creates easy fast break points while at the same time limiting the other teams offense.
Furthermore, Dyson and Herb move well without the ball on offense and they (especially Herb) are smart enough to disrupt and screen on offense.